58300000111195_ARA_en_f.doc – 02.06.09 Seite 96 von 102
7.5.5 Heater is not functioning
Fault description:
Does not heat up
Possible faults:
1. No control signal voltage from logic module
2. No voltage at power module heater output
3. No voltage at thermal release input
4. No voltage at heater connection
Troubleshooting:
1. Check control signal voltage from logic module
To do this, open the appliance. Using the Torx T10 screwdriver,
unscrew all rear panel screws and remove the rear panel. Remove
upper appliance cover to the rear. Remove both side panels upwards.
The control signal voltage is measured on plug CM9 on terminals 1 =
GND and 4 = 5 VDC. The heater must be actuated by drawing hot
water. The heater is actuated in pulses.
► No control voltage → Logic module or connecting cable
defective
► Voltage available → see Point 2
2. Check voltage on power module heater output
The voltage for the heater is measured on plug CP5 on terminal 5 =
neutral conductor (blue) and terminal 1 = phase (brown). The heater
must be actuated by drawing hot water. The heater is actuated in
pulses.
► No voltage
→ defective power module
► Voltage available → see Point 3
3. Check voltage on thermal release input
The operating voltage of the heater (= 230VAC) is measured at the
thermal release input (brown = under the insulation sleeve) and on the
blue terminal on the heating element.
► No voltage
→ defective wiring
► Voltage available → see Point 4
4. Check voltage on heater connection
The operating voltage of the heater (= 230 VAC) is checked on the
terminals of the heating element (brown = neutral conductor; blue =
phase).
► No voltage → interrupted thermal fuses
► Voltage available → defective heating element
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